"PEPFAR has said it will use" nearly $1.5 billion in unspent aid "to invest in commodities (condoms, HIV rapid test kits and voluntary medical male circumcision kits), systems and institutions, and program strengthening," Suzanne Ehlers, president of Population Action International, writes in this post in the Huffington Post's "Impact" blog. "Here's one idea that would offer a huge return on investment and save the lives of millions: voluntary contraception for women," she continues, adding, "Voluntary contraception has been called 'the best kept secret in HIV prevention' and has a proven evidence base."